System Prompt Generator

In short A system prompt sets the standing rules for an assistant, and it is a different job from writing a good one-off prompt. It has to cover five things: what the assistant is for, who it is talking to, the tone it holds across every reply, what it must refuse or redirect, and the shape of its output. The part people underwrite is refusals. An assistant with no stated boundaries will attempt anything asked of it, including questions it has no basis to answer, and a support bot confidently inventing a refund policy is a worse outcome than one that says it cannot help. Give it the explicit list: what to decline, what to hand to a human, and what to say while doing so. The second underwritten part is knowledge boundaries — stating plainly what the assistant does and does not know about your business prevents the most damaging failure mode, which is fluent invention. Keep it short enough to be followed. A system prompt of two thousand words competes with the user's actual message for the model's attention, and the rules at the end tend to lose.